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Triangle Calculator

Solve a triangle from any valid combination of sides and angles — SSS, SAS, ASA, AAS, or SSA.

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Uses the law of sines a/sin A = b/sin B = c/sin C and the law of cosines c² = a² + b² − 2ab cos C, picking the right identity for the given inputs.

In depth

Solve a triangle from any valid combination of sides and angles — SSS, SAS, ASA, AAS, or SSA.